Multi-mode heating system based on water source heat pump

Abstract

This invention discloses a multi-mode heating system based on a water source heat pump, including a heat pump tank, a first water source heat pump, and a second water source heat pump. The heating system also includes a steam generator, a steam compressor, a hot water storage tank, and a mixer. The steam outlet of the steam generator is connected to the inlet of the steam compressor. The outlet of the steam compressor is connected to the hot water storage tank via a steam pipe. The hot water storage tank is connected to the first mixing inlet of the mixer. The heat pump tank is connected to the second mixing inlet of the mixer. The mixing outlet of the mixer is connected to the heat source side inlet of the second water source heat pump. A steam supply pipe is connected to the steam pipe. This invention achieves different heating capacities for the first and second water source heat pumps by using water sources of different temperatures entering the heat source side, thus realizing two different heating modes to adapt to different user heating needs and increasing the adaptability of the water source heat pump.

Description

Technical Field

[0001] This invention belongs to the field of heating equipment technology, specifically relating to a multi-mode heating system based on a water source heat pump. Background Technology

[0002] Water source heat pumps utilize low-grade heat energy resources formed by absorbing solar and geothermal energy from shallow water sources on the Earth's surface, such as groundwater, rivers, and lakes. Employing the heat pump principle, they transfer low-grade heat energy to high-grade heat energy with a small amount of high-grade electrical energy input. They are generally used in situations with abundant water resources and relatively stable seasonal temperatures. Current water source heat pumps obtain water, transport it to the heat source side, extract heat from the water, and then transfer the extracted heat to the user side for energy supply. This relatively simple operating mode cannot meet the needs of applications requiring different heating temperatures. Therefore, it is necessary to research a water source heat pump heating system with different heating modes to solve this problem. Summary of the Invention

[0003] To address the aforementioned problems, the purpose of this invention is to provide a multi-mode heating system based on a water source heat pump to meet the needs of different heating temperature applications.

[0004] The technical solution for implementing the present invention is as follows:

[0005] A multi-mode heating system based on a water source heat pump includes a heat pump tank and a water source heat pump unit. The heat pump tank supplies water to the heat source side of the water source heat pump unit. The water source heat pump unit includes a first water source heat pump and a second water source heat pump. The heat source side inlet of the first water source heat pump is connected to the heat pump tank through a first pipe. A first delivery pump for transporting water from the heat pump tank to the heat source side of the first water source heat pump is installed on the first pipe.

[0006] The heating system also includes a steam generator, a steam compressor, a hot water storage tank, and a mixer. The steam outlet of the steam generator is connected to the inlet of the steam compressor. The outlet of the steam compressor is connected to the hot water storage tank via a steam pipe. The hot water storage tank contains water that has its temperature increased after exchanging heat with the steam entering the tank. The hot water storage tank has a first outlet, which is connected to the first mixing inlet of the mixer via a second pipe. A second delivery pump is installed on the second pipe. The heat pump water tank is connected to the second mixing inlet of the mixer via a third pipe. A third delivery pump is installed on the third pipe. The mixing outlet of the mixer is connected to the heat source side inlet of the second water source heat pump via a fourth pipe. A fourth delivery pump is installed on the fourth pipe. The water from the hot water storage tank in the mixer raises the temperature of the water supplied from the heat pump water tank and then sends it to the heat source side of the second water source heat pump. A steam supply pipe is connected to the steam pipe between the steam compressor and the hot water storage tank.

[0007] As one embodiment of this application, the heat source side outlet of the first water source heat pump and the heat source side outlet of the second water source heat pump are connected to a discharge pipe. The discharge pipe is connected to the inside of the hot water storage tank through a fifth pipe and to the inlet of the steam generator through a sixth pipe. A first control valve is installed on the discharge pipe, a second control valve is installed on the fifth pipe, and a third control valve is installed on the sixth pipe.

[0008] As one embodiment of this application, the connection between the steam supply pipe and the steam pipe is close to the steam compressor. At least one plate heat exchanger is installed on the steam pipe between the connection between the steam supply pipe and the steam pipe. The primary side of the plate heat exchanger is connected in series with the steam pipe. The inlet end of the secondary side of the plate heat exchanger is connected to a cold water inlet pipe, and the outlet end of the secondary side of the plate heat exchanger is connected to a high-temperature water supply pipe. A low-temperature water supply pipe is also connected to the hot water storage tank.

[0009] As an embodiment of this application, the second pipe and the third pipe have the same pipe diameter; a first mass flow meter for detecting the flow rate in the second pipe and a first regulating valve for adjusting the flow rate in the second pipe are installed on the second pipe; a second mass flow meter for detecting the flow rate in the third pipe and a second regulating valve for adjusting the flow rate in the third pipe are installed on the third pipe; a first temperature sensor for detecting the water temperature in the pipe and a flow sensor for detecting the water flow rate in the pipe are installed on the fourth pipe; the opening degree of the first regulating valve and the second regulating valve is controlled by the temperature value detected by the temperature sensor.

[0010] As an embodiment of this application, the process of the first temperature sensor controlling the first regulating valve and the second regulating valve is as follows: when the measured value of the first temperature sensor is greater than the upper limit setting value of the first temperature sensor, the opening degree of the first regulating valve is increased or the opening degree of the second regulating valve is decreased; when the measured value of the first temperature sensor is less than the lower limit setting value of the first temperature sensor, the opening degree of the first regulating valve is decreased or the opening degree of the second regulating valve is increased.

[0011] As one embodiment of this application, the hot water storage tank is equipped with a second temperature sensor for detecting the water temperature inside the hot water storage tank. When the measured value of the second temperature sensor is greater than the upper limit setting value of the second temperature sensor, the second control valve opens. When the measured value of the second temperature sensor is less than the lower limit setting value of the second temperature sensor, the second control valve closes.

[0012] As one embodiment of this application, the mixer includes a mixing shell, an inner mixing component, and an outer mixing component; a closed mixing space is formed inside the mixing shell, the outer mixing component is fixedly arranged in the mixing space, and the inner mixing component is fixedly disposed in the outer mixing component; the inner mixing component has an inner water distribution space communicating with a second pipe, and the outer mixing component has an outer water distribution space communicating with a third pipe, and the water in the inner water distribution space and the water in the outer water distribution space form convection.

[0013] As an embodiment of this application, the flow rate detected by the flow sensor is used to control the delivery volume of the second and third delivery pumps. When the flow rate value detected by the flow sensor is greater than the upper limit setting value of the flow sensor, the delivery flow rate of the second and third delivery pumps is reduced simultaneously. When the flow rate value detected by the flow sensor is less than the lower limit setting value of the flow sensor, the delivery flow rate of the second and third delivery pumps is increased simultaneously.

[0014] By adopting the above technical solution, the water supply to the heat source side of the first water source heat pump can directly come from the water tank of the heat pump. The water in the heat pump tank is actively transported to the first water source heat pump via a first delivery pump, enabling the first water source heat pump to have conventional heating capabilities. Compared to the heating temperature of the first water source heat pump, the second water source heat pump provides a higher heating temperature to meet the heating temperature requirements of different applications. The first water source heat pump can provide heating for small office areas, while the second water source heat pump can provide heating for large office areas and can also be used for other applications requiring higher temperatures. This invention achieves different heating capabilities for the first and second water source heat pumps by using water sources of different temperatures at their heat source sides, thus realizing two different heating modes to meet the different heating needs of users and increasing the adaptability of water source heat pumps. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the system of the present invention;

[0016] Figure 2 This is a schematic diagram of the internal structure of the mixer in this invention;

[0017] In the attached diagram, 10. Heat pump water tank; 11. First water source heat pump; 12. Second water source heat pump; 13. First pipeline; 14. First transfer pump; 15. Heat pump water source; 16. Steam generator; 17. Steam compressor; 18. Hot water storage tank; 19. Mixer; 20. Water inlet; 21. Steam pipeline; 22. Steam supply pipeline; 23. Second pipeline; 24. Second transfer pump; 25. Third pipeline; 26. Third transfer pump; 27. Fourth pipeline; 28. Fourth transfer pump; 29. ​​Discharge pipeline; 30. Fifth pipeline; 31. Sixth pipeline; 32. First control valve; 33. Second control valve; 34. Third control valve; 35. Plate heat exchanger; 36. Cold water inlet pipe; 37. High-temperature water supply pipe. Pipe, 38. Low-temperature water supply pipe, 39. First mass flow meter, 40. First regulating valve, 41. Second mass flow meter, 42. Second regulating valve, 43. First temperature sensor, 44. Flow sensor, 45. Second temperature sensor, 46. Seventh pipe, 47. Fourth control valve, 48. Mixing housing, 49. Inner mixing component, 50. Outer mixing component, 51. Mixing space, 52. Inner water distribution space, 53. Outer water distribution space, 54. Base, 55. First outer mixing shell, 56. Second outer mixing shell, 57. First bottom support, 58. First water distribution hole group, 59. Second bottom support, 60. Water distribution plate, 61. Second water distribution hole group, 62. Third water distribution hole group, 63. Mixing space. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the described embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0019] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having" and any variations thereof in the description, claims and foregoing drawings of this application are intended to cover non-exclusive inclusion.

[0020] In this application, the reference to "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0021] Please see Figure 1 , 2 As shown, a multi-mode heating system based on a water source heat pump includes a heat pump tank 10 and a water source heat pump unit. The heat pump tank 10 supplies water to the heat source side of the water source heat pump unit. The water source heat pump unit includes a first water source heat pump 11 and a second water source heat pump 12. The number of water source heat pumps can be increased according to the heating needs of the site. The heat source side inlet of the first water source heat pump 11 is connected to the heat pump tank 10 through a first pipe 13. A device for transferring water from the heat pump tank 11 to the first pipe 13 is installed on the first pipe 13. The water in tank 10 is delivered to the first delivery pump 14 on the heat source side of the first water source heat pump 11. The water in the heat pump tank 10 comes from the heat pump water source 15. The heat pump water source 15 can be groundwater, surface water, etc., and can be used as a water source for the heat pump. The water supply on the heat source side of the first water source heat pump 11 can come directly from the water supply in the heat pump tank 10. The first delivery pump 14 actively delivers the water in the heat pump tank 10 to the first water source heat pump 11, so that the first water source heat pump 11 has conventional heating capacity.

[0022] In a specific embodiment of the present invention, the heating system further includes a steam generator 16, a steam compressor 17, a hot water storage tank 18, and a mixer 19. The inlet of the steam generator 16 is a water inlet 20, which allows external water to enter the steam generator 16. The water forms a low-temperature, low-pressure steam medium in the steam generator 16. The steam outlet of the steam generator 16 is connected to the inlet of the steam compressor 17. The low-temperature, low-pressure steam medium discharged from the steam generator 16 is pressurized by the steam compressor 17 to form a high-temperature, high-pressure steam medium. The outlet of the steam compressor 17 is connected to the hot water storage tank 18 through a steam pipe 21. The steam pipe 21 between the steam compressor 17 and the hot water storage tank 18 is connected to a steam supply pipe 22. The steam is transported to the place of use through the steam supply pipe 22, such as the use of high-temperature, high-pressure steam in the production process of chemical enterprises. The hot water storage tank 18 stores water that has increased in temperature after exchanging heat with the steam entering the tank. The tank has a first outlet, which is connected to the first mixing inlet of the mixer 19 via a second pipe 23. A second delivery pump 24 is mounted on the second pipe 23. The heat pump tank 10 is connected to the second mixing inlet of the mixer 19 via a third pipe 25. A third delivery pump 26 is mounted on the third pipe 25. The mixing outlet of the mixer 19 is connected to the heat source side inlet of the second water source heat pump 12 via a fourth pipe 27. A fourth delivery pump 28 is mounted on the fourth pipe 27 to deliver water from the mixer to the water source heat pump. The water in the mixer 19 is heated by the heat storage tank. The water medium from water tank 18 raises the temperature of the water supplied from heat pump water tank 10 before sending it to the heat source side of the second water source heat pump 12. This increases the inlet water temperature entering the heat source side of the second water source heat pump 12, thereby increasing the heating temperature of the second water source heat pump 12. Compared with the heating temperature of the first water source heat pump 11, the heating temperature of the second water source heat pump 12 is higher to meet the heating temperature requirements of different applications. For example, in chemical plants, the first water source heat pump 11 can provide heating for small areas of office space, while the second water source heat pump 12 can provide heating for large areas of office space. It can also be used to meet the heating needs of chemical plant preparation processes (such as insulation of tanks during production). This invention achieves different heating capacities for the first water source heat pump 11 and the second water source heat pump 12 by using water sources of different temperatures to enter the heat source side, thereby realizing two different heating modes to meet the different heating needs of users and increase the adaptability of water source heat pumps.

[0023] In some embodiments, the heat source outlets of the first water source heat pump 11 and the second water source heat pump 12 are connected to a discharge pipe 29. The discharge pipe 29 is connected to the interior of the hot water storage tank 18 via a fifth pipe 30 and to the inlet of the steam generator 16 via a sixth pipe 31. A first control valve 32 is installed on the discharge pipe 29, a second control valve 33 is installed on the fifth pipe 30, and a third control valve 34 is installed on the sixth pipe 31. The water discharged from the water source heat pump can be discharged from the discharge pipe 29 to the return water port by opening the first control valve 32, or it can enter the hot water storage tank 18 through the fifth pipe 30 by opening the second control valve 33 to mix with the water in the hot water storage tank 18, or it can enter the steam generator 16 through the sixth pipe 31 and the inlet 20 of the steam generator 16 by opening the third control valve 34, thereby realizing multiple uses of the water returned from the water source heat pump.

[0024] In some embodiments, the connection point between the steam supply pipe 22 and the steam pipe 21 is close to the steam compressor 17. At least one plate heat exchanger 35 is installed on the steam pipe 21 between the connection point of the steam supply pipe 22 and the steam pipe 21. The primary side of the plate heat exchanger 35 is connected in series with the steam pipe 21. The inlet end of the secondary side of the plate heat exchanger 35 is connected to a cold water inlet pipe 36, and the outlet end of the secondary side of the plate heat exchanger 35 is connected to a high-temperature water supply pipe 37. Cold water is introduced from the cold water inlet pipe 36 and enters the plate heat exchanger 35. In the process, the cold water undergoes heat exchange with the steam passing through the plate heat exchanger 35, raising the temperature of the cold water, which is then discharged from the high-temperature water supply pipe 37 for use. Meanwhile, the high-temperature steam forms a liquid and enters the hot water storage tank 18, mixing with the water in the hot water storage tank 18 to raise the water temperature. The hot water storage tank 18 is also connected to a low-temperature water supply pipe 38, through which the water in the hot water storage tank 18 can be discharged for use at the end of the low-temperature water supply line, thereby further meeting the user's demand for hot water at different temperatures.

[0025] In some embodiments, to obtain accurate flow rates and facilitate flow rate configuration in the second pipe 23 and the third pipe 25, the second pipe 23 and the third pipe 25 use the same pipe diameter. A first mass flow meter 39 for detecting the flow rate in the second pipe 23 and a first regulating valve 40 for adjusting the flow rate in the second pipe 23 are installed on the second pipe 23. A second mass flow meter 41 for detecting the flow rate in the third pipe 25 and a second regulating valve 42 for adjusting the flow rate in the third pipe 25 are installed on the third pipe 25. A first temperature sensor 43 for detecting the water temperature in the pipe and a flow sensor 44 for detecting the water flow rate in the pipe are installed on the fourth pipe 27. The opening degree of the first regulating valve 40 and the second regulating valve 42 is controlled by the temperature value detected by the temperature sensor. The inlet water temperature on the heat source side of the second water source heat pump 12 is controlled by the first temperature sensor 43. The temperature detection of the first temperature sensor 43 automatically adjusts the opening state of the first regulating valve 40 and the second regulating valve 42 to produce water within the set range detected by the first temperature sensor 43, thereby ensuring a stable water supply temperature on the heat source side of the second water source heat pump 12.

[0026] In some embodiments, the flow rate detected by the flow sensor 44 is used to control the delivery volume of the second delivery pump 24 and the third delivery pump 26, ensuring the inlet water flow rate on the heat source side of the second water source heat pump 12. If the flow rate detected by the flow sensor 44 is greater than the upper limit setting value of the flow sensor 44, the delivery flow rate of the second delivery pump 24 and the third delivery pump 26 is reduced simultaneously. If the flow rate detected by the flow sensor 44 is less than the lower limit setting value of the flow sensor 44, the delivery flow rate of the second delivery pump 24 and the third delivery pump 26 is increased simultaneously, until the flow rate detected by the flow sensor 44 is within the set upper and lower limit range, and the delivery flow rate of the second delivery pump 24 and the third delivery pump 26 is maintained at this time.

[0027] In some embodiments, the process by which the first temperature sensor 43 controls the first regulating valve 40 and the second regulating valve 42 is as follows: when the measured value of the first temperature sensor 43 is greater than the upper limit setting value of the first temperature sensor 43, the opening degree of the first regulating valve 40 is increased, or the opening degree of the second regulating valve 42 is decreased; when the measured value of the first temperature sensor 43 is less than the lower limit setting value of the first temperature sensor 43, the opening degree of the first regulating valve 40 is decreased, or the opening degree of the second regulating valve 42 is increased, until the temperature value detected by the first temperature sensor 43 is within the set upper and lower value range, and the opening degree state of the first regulating valve 40 and the second regulating valve 42 is maintained at this time.

[0028] In some embodiments, the hot water storage tank 18 is equipped with a second temperature sensor 45 for detecting the water temperature inside the tank. When the measured value of the second temperature sensor 45 is greater than its upper limit setting, the second control valve 33 opens to add low-temperature water to the hot water storage tank 18, mixing the low-temperature water with the water in the tank and lowering the water temperature until the measured value of the second temperature sensor 45 is lower than its upper limit setting. When the measured value of the second temperature sensor 45 is less than its lower limit setting, the second control valve 33 closes, stopping the addition of low-temperature water to the tank. By ensuring that the water temperature inside the hot water storage tank 18 is within the set range, the supply temperature of the low-temperature water supply pipe 38 is guaranteed, and the water temperature entering the mixer 19 from the tank is kept stable, minimizing fluctuations in the water temperature entering the heat source side of the second water source heat pump 12 and thus reducing its impact on the heating capacity of the second water source heat pump 12.

[0029] In some embodiments, the heat source inlet of the first water source heat pump 11 is connected to the fourth pipe 27 via the seventh pipe 46. A fourth control valve 47 is installed on the seventh pipe 46. When the fourth control valve 47 is opened and the water supply from the first pipe 13 is closed, the first water source heat pump 11 and the second water source heat pump 12 can generate the same heating capacity, thereby realizing another combination of water source heat pumps and increasing the heating mode. The opening or closing of the fourth control valve 47 is determined according to the needs of the application site. Of course, the heat source inlets of the first water source heat pump 11 and the second water source heat pump 12 can also be connected in parallel with the first pipe 13. Water in the heat source tank can enter the heat source side of the first water source heat pump 11 and the heat source side of the second water source heat pump 12 respectively, realizing the working mode of the heat pump tank 10 supplying water to the first water source heat pump 11 and the second water source heat pump 12 simultaneously.

[0030] In some embodiments, to further ensure the uniformity and stability of the water temperature of the water source heat pump, the mixer 19 includes a mixing shell 48, an inner mixing component 49, and an outer mixing component 50. A closed mixing space 51 is formed inside the mixing shell 48, the outer mixing component 50 is fixedly arranged in the mixing space 51, and the inner mixing component 49 is fixedly disposed in the outer mixing component 50. The inner mixing component 49 has an inner water distribution space 52 that communicates with the second pipe 23, and the outer mixing component 50 has an outer water distribution space 53 that communicates with the third pipe 25. The water in the inner water distribution space 52 and the water in the outer water distribution space 53 form convection to mix the water in the second pipe 23 and the third pipe 25, thereby achieving temperature uniformity. The external mixing component 50 in this application includes a base 54, a first external mixing shell 55, and a second external mixing shell 56. The base 54 is fixedly installed in the mixing shell 48 by a first bottom support 57 and is suspended in the mixing space 51. The first bottom support 57 has a hollow structure. The first external mixing shell 55 is fixedly installed on the base 54, and the second external mixing shell 56 is fixed outside the first mixing shell and is arranged in a cover state outside the first external mixing shell 55. The aforementioned external water distribution space 53 is formed between the outer wall of the top plate of the first external mixing shell 55 and the inner wall of the top plate of the second external mixing shell 56. The third pipe 25 passes through the center of the top plates of the mixing shell 48 and the second external mixing shell 56 and communicates with the external water distribution space 53. In a specific implementation, a first water distribution hole group 58 is opened on the top plate of the first external mixing shell 55 to facilitate the downward flow of water in the external water distribution space 53.

[0031] In some embodiments, the inner mixing component 49 is a container with an open top. The bottom of the inner mixing component 49 is fixedly arranged inside the outer mixing component 50 in a suspended state by a second bottom support 59. A water distribution plate 60 is fixedly installed at the open top of the inner mixing component 49. A second water distribution hole group 61 is arranged on the water distribution plate 60. The second water distribution hole group 61 is located below the first water distribution hole group 58, and the water flowing out of the first water distribution hole group 58 will completely cover the water in the second water distribution hole group 61 to increase the mixing effect. The second pipe 23 extends from the center of the bottom of the inner mixing component 49 into the interior of the inner mixing component 49 and delivers water upward. The diameter of the water distribution holes in the second water distribution hole group is smaller than that in the first water distribution hole group, so that the water falling from the external water space has a relatively large flow rate, and the water flowing upward from the inner water distribution space has a relatively fast flow rate, so that the low temperature water and the high temperature water can be mixed efficiently.

[0032] In some embodiments, a third water distribution hole group 62 is respectively provided on the side plate of the first outer mixing shell 55 and the side plate of the second outer mixing shell 56. The water distribution holes in the two third water distribution hole groups 62 are staggered to further increase the water mixing capacity. A water mixing space 63 is reserved between the outer wall of the side plate of the first outer mixing shell 55 body 48 and the inner wall of the side plate of the second outer mixing shell 56. This serves two purposes: first, it increases the distance between the third water distribution hole groups 62, preventing water from flowing directly through them; second, the staggered arrangement of the water distribution holes in the two third water distribution hole groups 62 provides a certain mixing space for the water between them, further improving the mixing effect.

[0033] In some embodiments, the water distribution plate is arranged in an arc shape with the middle curving downwards, and the top plate of the first outer mixing shell 55 is also arranged in an arc shape with the middle curving downwards, so that the water flow converges towards their respective centers as much as possible. The curvature of the top plate of the first outer mixing shell is less than that of the water distribution plate. In this way, while the water in the outer water distribution space converges towards the center of the top plate of the first outer mixing shell, it also ensures that the area discharged downwards is still larger than the area of ​​the water distribution plate, ensuring that the water discharged from the inner water distribution space is always within the coverage of the water discharged from the outer water distribution space, thus ensuring the mixing effect. All components of the mixer 19 are made of stainless steel and are fixed together by welding to form the whole of the mixer 19.

[0034] The water flow process inside mixer 19 is as follows: Figure 2 As indicated by the arrow, high-temperature water in the second pipe 23 enters the inner water distribution space 52 of the inner mixing component 49 and flows upward. Low-temperature water in the third pipe 25 enters the outer water distribution space 53 of the outer mixing component 50 and flows downward, mixing with the upward-flowing high-temperature water for the first time. After the first mixing, the water flows towards the space between the outer side of the inner mixing component 49 and the inner side of the outer mixing component 50. Some of the mixed water flows through the third water distribution hole group 62 into the space between the outer side of the outer mixing component 50 and the inner side of the mixing shell 48, and then flows out through the fourth pipe 27 connected to the bottom of the mixing shell 48. Some of the water that does not pass through the third water distribution hole group 62 mixes in the space formed by the outer side of the inner mixing component 49 and the inner side of the outer mixing component 50, thereby ensuring the sufficient mixing of high-temperature water and low-temperature water.

[0035] Finally, it should be noted that the above embodiments are merely preferred embodiments of the present invention used to illustrate the technical solutions of the present invention, and are not intended to limit them, much less limit the patent scope of the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention. In addition, the direct or indirect application of the technical solutions of the present invention to other related technical fields is similarly included within the patent protection scope of the present invention.

Claims

1. A multi-mode heating system based on a water source heat pump, comprising a heat pump water tank and a water source heat pump unit, wherein the heat pump water tank supplies water to the heat source side of the water source heat pump unit, characterized in that, The water source heat pump unit includes a first water source heat pump and a second water source heat pump. The heat source side inlet of the first water source heat pump is connected to the heat pump water tank through a first pipe. A first delivery pump for transporting water from the heat pump water tank to the heat source side of the first water source heat pump is installed on the first pipe. The heating system also includes a steam generator, a steam compressor, a hot water storage tank, and a mixer. The steam outlet of the steam generator is connected to the inlet of the steam compressor. The outlet of the steam compressor is connected to the hot water storage tank via a steam pipe. The hot water storage tank stores water that has been heated by exchanging heat with the steam entering the tank. The hot water storage tank has a first outlet, which is connected to the first mixing inlet of the mixer via a second pipe. A second delivery pump is installed on the second pipe. The heat pump water tank is connected to the second mixing inlet of the mixer via a third pipe. A third delivery pump is installed on the third pipe. The mixing outlet of the mixer is connected to the heat source side inlet of the second water source heat pump via a fourth pipe. A fourth delivery pump is installed on the fourth pipe. The water from the hot water storage tank in the mixer raises the temperature of the water supplied from the heat pump water tank and then sends it to the heat source side of the second water source heat pump. A steam supply pipe is connected to the steam pipe between the steam compressor and the hot water storage tank. The mixer includes a mixing shell, an inner mixing component, and an outer mixing component; a closed mixing space is formed inside the mixing shell, the outer mixing component is fixedly arranged inside the mixing space, and the inner mixing component is fixedly installed inside the outer mixing component; the inner mixing component has an inner water distribution space that communicates with a second pipe, and the outer mixing component has an outer water distribution space that communicates with a third pipe, and the water in the inner water distribution space and the water in the outer water distribution space form convection. The external mixing component includes a base, a first external mixing shell, and a second external mixing shell. The base is fixedly installed in the mixing shell by a first bottom bracket and is suspended in the mixing space. The first bottom bracket has a hollow structure. The first external mixing shell is fixedly installed on the base, and the second external mixing shell is fixed outside the first mixing shell and is arranged outside the first external mixing shell in a cover-like state. The aforementioned external water distribution space is formed between the outer wall of the top plate of the first external mixing shell and the inner wall of the top plate of the second external mixing shell. A third pipe passes through the center of the top plates of the mixing shell and the second external mixing shell and communicates with the external water distribution space. A first water distribution hole group is opened on the top plate of the first external mixing shell. The inner mixing component consists of an open container at the top. The bottom of the inner mixing component is suspended and fixed inside the outer mixing component via a second bottom support. A water distribution plate is fixedly installed at the open top of the inner mixing component. A second water distribution hole group is arranged on the water distribution plate. The second water distribution hole group is located below the first water distribution hole group, and the water flowing out of the first water distribution hole group will completely cover the water in the second water distribution hole group. A second pipe extends from the center of the bottom of the inner mixing component into the interior of the inner mixing component and delivers water upwards. The diameter of the water distribution holes in the second water distribution hole group is smaller than the diameter of the water distribution holes in the first water distribution hole group. The side plates of the first and second outer mixing shells are respectively provided with third water distribution hole groups, and the water distribution holes in the two third water distribution hole groups are staggered; a water mixing space is reserved between the outer wall of the side plate of the first outer mixing shell and the inner wall of the side plate of the second outer mixing shell.

2. The multi-mode heating system based on a water source heat pump according to claim 1, characterized in that, The first water source heat pump and the second water source heat pump are connected to a discharge pipe. The discharge pipe is connected to the inside of the hot water storage tank through the fifth pipe and to the inlet of the steam generator through the sixth pipe. A first control valve is installed on the discharge pipe, a second control valve is installed on the fifth pipe, and a third control valve is installed on the sixth pipe.

3. The multi-mode heating system based on a water source heat pump according to claim 1, characterized in that, The connection point between the steam supply pipe and the steam pipeline is close to the steam compressor. At least one plate heat exchanger is installed on the steam pipeline between the connection point of the steam supply pipe and the steam pipeline. The primary side of the plate heat exchanger is connected in series with the steam pipeline. The inlet end of the secondary side of the plate heat exchanger is connected to a cold water inlet pipe, and the outlet end of the secondary side of the plate heat exchanger is connected to a high-temperature water supply pipe. A low-temperature water supply pipe is also connected to the hot water storage tank.

4. The multi-mode heating system based on a water source heat pump according to claim 1, characterized in that, The second and third pipes have the same diameter; the second pipe is equipped with a first mass flow meter for detecting the flow rate in the second pipe and a first regulating valve for adjusting the flow rate in the second pipe; the third pipe is equipped with a second mass flow meter for detecting the flow rate in the third pipe and a second regulating valve for adjusting the flow rate in the third pipe; the fourth pipe is equipped with a first temperature sensor for detecting the water temperature in the pipe and a flow sensor for detecting the water flow rate in the pipe; the opening degree of the first regulating valve and the second regulating valve is controlled by the temperature value detected by the temperature sensor.

5. The multi-mode heating system based on a water source heat pump according to claim 4, characterized in that, The process of the first temperature sensor controlling the first regulating valve and the second regulating valve is as follows: when the measured value of the first temperature sensor is greater than the upper limit setting value of the first temperature sensor, the opening degree of the first regulating valve is increased, or the opening degree of the second regulating valve is decreased; when the measured value of the first temperature sensor is less than the lower limit setting value of the first temperature sensor, the opening degree of the first regulating valve is decreased, or the opening degree of the second regulating valve is increased.

6. The multi-mode heating system based on a water source heat pump according to claim 1, characterized in that, The hot water storage tank is equipped with a second temperature sensor for detecting the water temperature inside the tank. When the measured value of the second temperature sensor is greater than the upper limit setting value of the second temperature sensor, the second control valve opens; when the measured value of the second temperature sensor is less than the lower limit setting value of the second temperature sensor, the second control valve closes.

7. The multi-mode heating system based on a water source heat pump according to claim 4, characterized in that, The flow rate detected by the flow sensor is used to control the delivery volume of the second and third delivery pumps. When the flow rate detected by the flow sensor is greater than the upper limit setting value of the flow sensor, the delivery flow rate of the second and third delivery pumps is reduced at the same time. When the flow rate detected by the flow sensor is less than the lower limit setting value of the flow sensor, the delivery flow rate of the second and third delivery pumps is increased at the same time.

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